The Barolians were a species known for trading a great deal with the Romulan Star Empire. This trade occured along the Barolian trade route.
Senator Pardek attended a Barolian trade conference in 2364. In 2368 a Barolian freighter transported a stolen Vulcan deflector to Galorndon Core. (TNG: "Unification I", "Unification II").
This species was only mentioned in dialogue.